Hello I have a 2000 CADILLAC DEVILLE. The problem that I am experiencing is when I go to brake, there is like a....vibrating pump in the brake pedals. I thought it was the brakes so had brakes and rotors (front replaced) when got car back from shop I noticed was doing same thing as when I took it. I figured it prob needed to break in a little, but then it went on for the whole week. I take car back to shop they call me back and say that it could be the ABS system and that it is normal. UH NORMAL??? NO SIR NO MAAM!! My brake pedal pumping or making a grinding noise when I go to slow down IS NOT NORMAL! Suggestions please.

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Not likely the ABS pump there is something wrong with the mechanical brakes it sounds like the emergency brake is not adjusted try adjusting the rear cable first then pull the emergency brake and push your foot on the brake if it is still to the floor you have a problem with a cylinder or a mechanical adjustment, if it's higher with the E brake on then you have the adjusters not set right and the cables not adjusted, So adjust the cables first. If the brakes are spongy with the engine off then it will need to be power bleed if that does not fix it then you may have the wrong brake shoes or pads on the car. Did you install the plates in the wheel rotor front braes? If not you lose 1/4 inch travel on the from pads, if the basic brakes are not right the ABS side is not going to be right so those problems have to be dealt with first. Also DO YOU HAVE A POWER ASSIST BOOSTER IF SO IT COULD BE BAD, TO TEST HAVE SOMEONE STEP ON THE BRAKE PEDAL AND PULL THE HOSE OFF THE BRAKE BOOSTER IT'S behind the master cylinder (sorry for the caps) if you don't here a suction sound when you remove the hose then you have a bad heck valve by the booster connected to the hose that plugs into the booster. if all of this is ok then it may be the ABS booster but normally its a bleeding problem. write a comment if this does not help or you need another lead,

if the abs pump is making noise you either have an air pocket in it or a bad pump, so this is what you need to do have the car pluged in to a modis and have them run a bleeder program, this will make the pump bleed the air from the system, the problem with doing some of this maintanance at home is sometimes you need specialty tools to do the job right this requires a $8,000.00 computer to make sure the air is purged from the system. call a shop and ask them what they will charge to do this. my shop where i work would charge around $25.00 to run this with the modis...
good luck

The air seeping is a dead giveaway. Your power brakes are now manual brakes, but stiffer. The diaphram in the brake booster has torn and the hissing noise is the engine vacuum escaping (you hear it louder when you depress the pedal right?). Replace the booster and you will be fine. The brake lights probably don't work because you can't push the pedal down far enought to release the switch. Please rate. Thanks.

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Related Questions:

Sounds like a fault with the Antilock Braking System. The vibration in the pedal is the ABS working. With your foot on the brake pedal, it releases and re-applies the brakes to stop a skid from the wheels locking up. You need professional service for brakes.

Seems to be a known issue on all Cadillac and requires the ABS module to be replaced.

Look for the wires leading to the light on the 2000 Cadillac Deville.
Try to figure out which one leads to the 'white' light that is for backup.
If there is a replaceable bulb, then there should be a way of rotating a socket out from behind.
Some Devilles have LED lighting for the red brake lights, I think.

do u feel the vibration in the steering wheel or in the seat,i bet the most vibration was coming out of the front brakes and a little out of the rear brakes,u might want to change the rear brakes if the vibration is still annoying,also were the front wheels torqued to spec when installed?? if not u might end up with warped front brakes again,hope this helped

If you like go ahead and let someone sell and replace your transmission
but here is my suggestion! Check around and see if you can find a minor
vacuum leak! This can simply be the big round hose that goes from the
fuel injection to the power brake hub! This is normally a push in
connector which has about a 1/2 inch hose clamped on it! If there is
any kink or the connector is not in correctly a leak will occur and the
transmission will shift rough as though you will be thrown out of the
vehicle! Try unplugging this connector and plug it back in hard and
straight and maybe you will be lucky and fix your problem. If the
vacuum is correct your transmission will shift better than you have
ever experienced!